+ 6. Added CONFIGURE_GROUP build-time option.
+
+ 7. Some older OS have a limit of 256 on the maximum number of file
+ descriptors. Exim was using setrlimit() to set 1000 as a large value
+ unlikely to be exceeded. Change 4.43/17 caused a lot of logging on these
+ systems. I've change it so that if it can't get 1000, it tries for 256.